Vollmer won the women’s 50m fly in 26.18. She was followed by fellow 2012 Olympian Claire Donahue (Bowling Green, Ky.) in 26.77. Kelsi Worrell (Mt. Holly, N.J.) finished third in 26.94.

Ervin won the men’s 50m free with a time of 22.01, his best mark of the year thus far. Brazil’s Marcelo Chierighini was a close second in 22.09, and two-time Olympian Cullen Jones (Irvington, N.J.) placed third in 22.16. The women’s 50m free was won by Jessica Hardy (Long Beach, Calif.) with a time of 25.09, earning the Olympic gold medalist her third win of the meet. Madison Kennedy (Avon, Conn.) and Megan Romano (St. Petersburg, Fla.) tied for second place with a time of 25.12.

Romano also took home a win in the women’s 100m back, winning the event in 1:00.83. Kathleen Baker (Charlotte, N.C.) placed second in 1:00.98, while Kaitlin Hardy (Gardener, Mass.) rounded out the top three with a time of 1:01.59. The men’s 100m back was won by Andrew teDuits (Fitchburg, Wis.) in 54.43. David Plummer (Oklahoma City, Okla.) placed second in 54.45, and Ryan Murphy (Jacksonville, Fla.) was third in 54.49.

In the 400m free, Chloe Sutton (Mission Viejo, Calif.) won the women’s side in 4:09.10. Gillian Ryan (Kutztown, Pa.) finished second in 4:09.70, while Leah Smith (Pittsburgh, Pa.) was third in 4:10.85. Connor Jaeger (Fair Haven, N.J.) won the men’s event in 3:48.77, Michael McBroom (The Woodlands, Texas) was second in 3:50.77 and Matt McLean (Sterling, Va.) was third in 3:51.57

In other races, Venezuela's Andreina Pinto won the 200m fly in 2:12.40. Meredith Hoover (Concord, N.C.) was second in 2:12.57, and Lauren Harrington (Memphis, Tenn.) took third in 2:13.28. Singapore’s Joseph Schooling followed with a win in the men’s 200m fly in 1:57.79. Tom Luchinger (Mt. Sinai, N.Y.) was second in 1:58.80, and Dan Madwed (Stamford, Conn.) placed third in 1:59.60. In the women’s 200m breast, Annie Zhu (Brooklyn, N.Y.) won in 2:27.16. Laura Sogar (Exeter, R.I.) was second in 2:27.17, and Molly Hannis (Santa Rosa, Calif.) was third with a time of 2:30.72. Mike Alexandrov (Champaign, Ill.) won the men’s 200m breast in 2:13.60. Colombia’s Jorge Murillo was second in 2:14.44, and Chase Kalisz (Bel Air, Md.) was third in 2:14.51. The final race of the night saw Chierighini win the 50m fly in 23.72. Jones placed second in 24.03, and Eugene Godsoe (Greensboro, N.C.) was third in 24.17

Following the Arena Grand Prix at Charlotte, the Series will make its final stop May 30-June 2 in Santa Clara, Calif. As part of USA Swimming’s new, eight-year partnership with Arena, the Arena Grand Prix Series will offer swimmers the opportunity to take home prize money for top finishes in all individual Olympic-distance events for each meet in the Series. An overall leaderboard for the Series can be found online here.

The Arena Grand Prix Series serves as an opportunity for swimmers to race against some of the best competition in the country as they continue their preparation for the 2013 Phillips 66 National Championships and World Championships Trials in Indianapolis, Ind., the World University Games in Kazan, Russia, and the FINA World Championships in Barcelona, Spain.